Needle-valve control of oil stoves



Aug. 1s, 192.5. 1,550,002

M. C. SHELTON NEEDLE VALVE GONTRDL OF OIL STOVES Filed July u", 1925 ...NNI

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20g Wor-hfr Patented Aug. 18, 1925.

UNITED TES MAURICE C. SI-IEIJTON, OF INDIANAPOLIS,

INDIANA, ASSIGNOR TO SHELTON VAPOR STO'VE COMPANY, OF INDIANAPOLIS, INDIANA.

NEEDLE-VALVE CONTROL OF OIL STOVES.

Application filed July 7,

To all whom t may concern:

Be it known that I, MAURICE C. SHELTON, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented new and useful Improvements in Needle-Valve Controls of Oil Stoves, of which the following is a specilication.

It is the object of my invention to provide a stove of the arrangement so as to permit the use of a volatile hydrocarbon fuel, such as gasoline, in the preliminary heating of a vapor generator', and the use of a less volatile hydrocarbon fuel, such as kerosene, after such preliminary heating has progressed to the temperature whereby the less volatile fuel will be readily vaporized.

To accomplish this purpose, it is the particular object of my invention to control the flow of the two liquid fuels through suitable piping and a single valve for each burner of the stove, in such manner that either fuel may be used selectively through such valve and the rate of flow of either fuel be controlled and indicated.

I accomplish the foregoing and other objects which will hereinafter appear, by the mea-ns illustrated in the accompanying drawings, in which- Fig. 1, is a plan view of my dual control valve as attached to the fuel supply pipes; Fig. 2, a front elevation of my dual control valve; Fig. 3, a side elevation of the fuel pipe which connects the valve to t-he vapor generator; Fig. 4, an elevation of my control valve-plug; and Fig. 5, a vertical section of my control valve taken on the line 5-5 of Fig. 1.

Like characters of reference represent like parts throughout the several views of the drawing.

A tank 5 is provided with the partition 6, so that a storage of gasoline is provided in one end of the tank and kerosene in the other. The tank 5 is suitably mounted on the back of the hood 7 and above the plane of the stove top 8. The grid 9 is supported by the stove top 8.

The separate fuels flow by gravity down from tank 5, through the pipes 10 and 11 to the opposite sides of the valves 12, as indicated.

The valve 12 is rigidly connected to pipes 10 and 11 by means such as the union nuts 13. The valve 12 comprises the body 14,

1923. Serial No. 650,122.

having a central conically tapered seat in which the valve plug 15 closely contacts. Intimate contact, such as to prevent leakage of the liquid fuels, of the valve plug 15 with its seat in valve-body 14, is secured by a downward pull on the valve plug 15 by the spring 16, which is compressed between the washer 17, bearing on the body 14, and the washer 18, which is retained by Cotter-pins engaging in the holes 19 in the valve plug l5. The valve plug 15 has the ports 20 and 21 drilled transversely, opening into the central vertical passage 22. This central passage 22 extends downward, forms theI needle valve seat 23, and terminates in the nozzle 24.

Fitted in this central passage 22, above the port openings and 21, by fine screwv threads, is the needle 25, which may be rotated by the knurled-head 26 carrying an indicating point 27. The liquid fuel is prevented from passing up around the needle 25, by suitable packing 28, compressed by the packing-nut 29.

Formed, preferably integral, with the upper end of the valve plug 15, is the indicating dial 30. The valve plug 15 may be rotated in the seat of the valve body 14, by a suitable handle 31, secured to the valve plug 15 by the screw 32.

To operateJ the stove, I bring all valve handles 31, to the outward position at right angles to the supply pipes 10 and 11. The compartments of the tank 15 are filled with gasoline and kerosene. I turn all adjusting heads 26 to the left (downwardly) continuing such rotation until the needles firmly rest on the needle valve seats 23.

Selecting that burner, which I desire to operate, I turn valve handle 31 to the right until valve plug 21 coincides with the valvebody port 33, as in Fig. 5. This point of coincidence is predetermined by means of the lug 34 on the valve plug 15, coming into contact with such a shoulder or stop 35, as indicated in Fig. 2, in another point of port coincidence. Gasoline will flow from its respective compartment in tank 5 through pipe 11, through valve-body port 33, and valve plug port 21, into the central passage 22 of valve plug 15. I then turn the adjusting head 26, to the right slightly, such that the indicating point 27 comes between the numerals 10 and 20, on the dial 30, as shown in Fig. 1. I have shown the dial graduated to correspond to the number of drops of the liquid fuel per minute, although it can be otherwise graduated, arbitrarily. Upon the adjustment of head 2G, as above stated, the. gasoline will pass over needle valve seat 23 and drop from nozzle 24 at the rate of between 10 and 2O drops per minute.

Attached to the valve body 14, by screw threads 36, Fio's. 2 and 3, is the generator supply pipe 3l. The gasoline drops from the nozzle 24 into this supply pipe 37, and Hows by gravity to the burner generator cup not shown. The pipe 37, is cut away as at 39, Fig. 2 and Fig. 3, to permit observation of the fiow of fuel as it drops from the nozzle 24. When the gasoline flows into the cup, it may be ignited, and with a suitable burner (not shown) the heat of combustion produces a vapor which burns with intense heat and a non-luminous flame.

rIhe burner may be continuously operated on gasoline as above indicated, but I find it more preferable to use kerosene after preheating the burner as described. To so operate, I turn the handle 31 to the left until lug 34, Fig. 2, contacts with stop 35. In `this position the port 2O of the valve plug 15 coincides with the port 40 of the valve-body 14, Fig. 5.

The port 33 of the valve-body is thus closed by the wall of the valve plug 15. The flow of gasoline is stopped and kerosene flows from its compartnient in tank 5 through pipe 10, valveebody port 40, down through valve plug 15 and drops from nozzle 24. I find that the adjusting head 26 must be turned further to the right, that is lifting the needle 25 from its seat 23, in using kerosene in place of gasoline on account 0f the difference in viscosity.

In using either fuel, the adjusting head 2 6 may be turned to raise or lower needle 25 and so regulate rate of flow of the fuel, and hence regulate the. amount of heat pror duced at the burner. For instance, in practice, lthe adjusting head may be turned to point 2O on the dial 30, to produce a low heat, or to point to produce an intense heat, depending` upon the will of the operator.

lVhile I have here shown the best embodiment of my invention now known to me, it is capable of variations without departing from the spirit of the invention and I therefore do not desire to be limited t0 the precise forms shown, nor to the use of fuels mentioned, nor any more than is required by the appended claims, and having fully described my invention what I claim is 1. In an oil stove, a dual control valve, having a valve plug with ports of channels passing transversely through the valve plug to a central vertical passage in said valve plug, said valve plug having a central vertical passage through a depending nozzle at the lower end; a needle valve in the valve plug readily adjusted from without the valve independently of valve plug rotative position; and a means of packing around the needle valve within the central passage of plug.

2. In an oil stove, an indicating needle control valve, having a valve plug with ports of channels passing transversely through the valve plug to a central vertical passage within said valve plug; a downward, depending nozzle through which the central vertical passage of said valve plug passes; a needle valve within the valve plue, readily and independently adjustable from without the dual control valve; means of packing around the needle valve needle; stops to limit rotation of said valve plug; and a handle attached to said valve plug.

3. In an oil stove, a valve-body having a valve plug with a central passage with ports 0f channels entering transversely therein, and having a valve plug with depending nozzle; an externally adjustable needle valve in a central passage of said valve plug, said plug being held in contact with the valve-body seat by a spring; an indicating dial; and an indicating pointer movable over said dial.

4. In an oil stove, a dual control valve body having transverse passages thereL through; parallel fuel pipes intercepting the passages of said valve body; a valve plug conically seated in the control valve body, said valve plug having ports to register selectively with ports of the vtransverse passages in the said valve body, and channels from said valve plug ports entering a central vertical passage within the valve plug; a downwardly depending valve plug nozzle; means of limit-ing said valve plug` rotation; a dial integral with said valve plug and rotating therewith; an adjusting needle valve within the central passage of said valve plug; a needle valve adjusting head; an indicator on said adjusting head; a valve plug handle; means of compressively seating said valve plug on its seat; means of packing around the needle valve stem; and a. Vfuel discharge pipe extending from the depending nozzle of said valve' plug; and means in said discharge pipe for observation of the How of fuel `from said depending nozzle.

Signed at Indianapolis, Indiana, this the 25th day of June. 1923.

MAURICE C. SHELTON. 

